Some suggested messages:
It's not just one Iraqi, Mr. President.
Over 4,000 dead Americans--nearly 100,000 dead civilians. Injuries for decades to come.
Nice insurgency, Mr. President.
You said we'd be greeted as liberators.
Hey, hey, GWB
There's no saving your legacy.
And my personal favorite:
But if the cause be not good, the king himself hath a heavy reckoning to make, when all those legs and arms and heads, chopped off in battle, shall join together at the latter day and cry all 'We died at such a place;' some swearing, some crying for a surgeon, some upon their wives left poor behind them, some upon the debts they owe, some upon their children rawly left. I am afeard there are few die well that die in a battle; for how can they charitably dispose of any thing, when blood is their argument? Now, if these men do not die well, it will be a black matter for the king that led them to it; whom to disobey were against all proportion of subjection.
Henry V, Act IV--William Shakespeare